Genetics and Genetic Engineering

A Dictionary of Plant Sciences A Dictionary of Zoology World Encyclopedia A Dictionary of Ecology Further reading

heterozygote

A Dictionary of Plant Sciences | 1998 | | Copyright

heterozygote A diploid or polyploid individual that has different alleles (forms of a given gene) at at least one locus. Its phenotype is often identical to that of an individual that has one of these alleles in the homozygous state. (For example, the phenotype of A₁A₂ may be identical to that of A₁A₁, but different from that of A₂A₂.) If so, that allele (A₁) is said to be dominant over the other (A₂), which is said to be recessive. When there exist only 2 alleles of a gene and when one of these is dominant over the other, one may use a lower-case letter for the recessive allele; e.g., one may write Aa rather than A₁A₂. However, alleles are not always dominant one over another (see PARTIAL DOMINANCE); and often there are more than 2 alleles at a given locus (see MULTIPLE ALLELISM), especially in polyploids. Because it has two or more different alleles at a given locus, a heterozygote does not breed true.

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MICHAEL ALLABY. "heterozygote." A Dictionary of Plant Sciences. 1998. Encyclopedia.com. 26 May. 2012 <http://www.encyclopedia.com>.

MICHAEL ALLABY. "heterozygote." A Dictionary of Plant Sciences. 1998. Encyclopedia.com. (May 26, 2012). http://www.encyclopedia.com/doc/1O7-heterozygote.html

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heterozygote

A Dictionary of Zoology | 1999 | | Copyright

heterozygote A diploid or polyploid individual that has alleles at at least one locus. Its phenotype is often identical to that of an individual that has one of these alleles in the homozygous state. For example, the phenotype of A₁A₂ may be identical to that of A₁A₁, but different from that of A₂A₂. If so, that allele (A₁) is said to be dominant over the other (A₂), which is said to be recessive. When there exist only two alleles of a gene and when one of these is dominant over the other, one may use a lower-case letter for the recessive allele (e.g. one may write Aa rather than A₁A₂). However, alleles are not always dominant one over another; and often there are more than two alleles at a given locus, especially in polyploids. Because it has two or more different alleles at a given locus, a heterozygote does not breed true.

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MICHAEL ALLABY. "heterozygote." A Dictionary of Zoology. 1999. Encyclopedia.com. 26 May. 2012 <http://www.encyclopedia.com>.

MICHAEL ALLABY. "heterozygote." A Dictionary of Zoology. 1999. Encyclopedia.com. (May 26, 2012). http://www.encyclopedia.com/doc/1O8-heterozygote.html

MICHAEL ALLABY. "heterozygote." A Dictionary of Zoology. 1999. Retrieved May 26, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O8-heterozygote.html

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heterozygote

World Encyclopedia | 2005 | Copyright

heterozygote (symbol Hz) Organism possessing two contrasting forms (alleles) of a gene in a chromosome pair. In cases where one form is dominant and the other recessive, only the dominant form is expressed in the phenotype (physical characteristics). A homozygote has identical forms of a gene.

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heterozygote

A Dictionary of Ecology | 2004 | | Copyright

heterozygote An organism or cell that is heterozygous.

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MICHAEL ALLABY. "heterozygote." A Dictionary of Ecology. 2004. Encyclopedia.com. 26 May. 2012 <http://www.encyclopedia.com>.

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heterozygote

The Columbia Encyclopedia, 6th ed. | 2011 | Copyright

heterozygote : see genetics .

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